Problematic formatting of perflog headers when using perflog_compat

[teojgo]

For example for the perflog header based on format: https://github.com/eth-cscs/cscs-reframe-tests/blob/dea38f67cd1c5ff9d80f7dbd785854733433d86d/config/common.py#L54

A final header looks as follows:
job_completion_time|version|info|jobid|num_tasks|perf_var=perf_value|perf_ref perf_lower_thres,perf_upper_thres)perf_unit

[vkarak]

Oh yeah, I've come across it and have noted it down to open an issue about.

[vkarak]

This happens when you use the perflog_compat only.

[vkarak]

I think the header generator gets confused from the spaces and the parenthesis in the format. Here is the regex used:

reframe/reframe/core/logging.py

Line 172 in 09ae029

self.__attr_patt = re.compile(r'\%\((.*?)\)s(.)?')

And here the groups extracted:

reframe/reframe/core/logging.py

Lines 191 to 193 in 09ae029

	for m in self.__attr_patt.finditer(fmt):
	attr = m.group(1)
	delim = m.group(2)